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Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 1,671,786 | $ 1,558,306
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 903,966 | 855,692
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 711,710 | 662,306
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 192,256 | 193,386
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 192,596 | 176,376
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 575,224 | 526,238
Subordinate Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 575,067 | 526,095
Subordinate Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 157 | 143
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 1,861,814 | 1,808,992
Credit reserve | (83,276) | (116,870)
Unamortized discount, net | (304,293) | (298,469)
Amortized cost | 1,474,245 | 1,393,653
Gross unrealized gains | 204,710 | 187,786
Gross unrealized losses | (7,169) | (23,133)
Carrying Value | 1,671,786 | 1,558,306
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 710,620 | 670,051
Credit reserve | (5,476) | (10,144)
Unamortized discount, net | (37,763) | (44,133)
Amortized cost | 667,381 | 615,774
Gross unrealized gains | 45,952 | 47,980
Gross unrealized losses | (1,623) | (1,448)
Carrying Value | 711,710 | 662,306
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 209,967 | 218,603
Credit reserve | (9,697) | (13,840)
Unamortized discount, net | (36,387) | (36,882)
Amortized cost | 163,883 | 167,881
Gross unrealized gains | 28,385 | 25,654
Gross unrealized losses | (12) | (149)
Carrying Value | 192,256 | 193,386
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 223,389 | 214,046
Credit reserve | (17,788) | (30,429)
Unamortized discount, net | (89,089) | (80,188)
Amortized cost | 116,512 | 103,429
Gross unrealized gains | 76,084 | 72,947
Carrying Value | 192,596 | 176,376
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 717,838 | 706,292
Credit reserve | (50,315) | (62,457)
Unamortized discount, net | (141,054) | (137,266)
Amortized cost | 526,469 | 506,569
Gross unrealized gains | 54,289 | 41,205
Gross unrealized losses | (5,534) | (21,536)
Carrying Value | $ 575,224 | $ 526,238

X
- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition Balance of credit reserve on available-for-sale securities. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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